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Justin Ethier 2017-12-04 18:54:39 -05:00
parent a260474e7d
commit f561428d7e
1 changed files with 80 additions and 57 deletions
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137
tests/when.scm
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@ -1,65 +1,88 @@
(import (scheme base) (scheme write))
(define-syntax my-when
(syntax-rules ()
((my-when test result1 result2 ...)
(if test
(begin result1 result2 ...)))))
(define-syntax my-when2
(syntax-rules ()
((my-when test result1 result2 ...)
(list result2 ...))))
;(write
; (my-when2 #t 1))
(define my-when2*
(lambda (expr$28 rename$29 compare$30)
(car ((lambda (tmp$42)
(if tmp$42
tmp$42
(cons (error "no expansion for" expr$28) #f)))
((lambda (v.1$36)
(if (pair? v.1$36)
((lambda (v.2$37)
((lambda (test)
((lambda (v.3$38)
(if (pair? v.3$38)
((lambda (v.4$39)
((lambda (result1)
((lambda (v.5$40)
(if (list? v.5$40)
((lambda (result2)
(cons (cons-source
(rename$29 'list)
(cons-source test '() '(test))
'(list test))
#f))
v.5$40)
#f))
(cdr v.3$38)))
v.4$39))
(car v.3$38))
#f))
(cdr v.1$36)))
v.2$37))
(car v.1$36))
#f))
(cdr expr$28))))))
;(define-syntax my-when
; (syntax-rules ()
; ((my-when test result1 result2 ...)
; (if test
; (begin result1 result2 ...)))))
;
;(define-syntax my-when2
; (syntax-rules ()
; ((my-when test result1 result2 ...)
; (list result2 ...))))
;
;;(write
;; (my-when2 #t 1))
;
; (define my-when2*
; (lambda (expr$28 rename$29 compare$30)
; (car ((lambda (tmp$42)
; (if tmp$42
; tmp$42
; (cons (error "no expansion for" expr$28) #f)))
; ((lambda (v.1$36)
; (if (pair? v.1$36)
; ((lambda (v.2$37)
; ((lambda (test)
; ((lambda (v.3$38)
; (if (pair? v.3$38)
; ((lambda (v.4$39)
; ((lambda (result1)
; ((lambda (v.5$40)
; (if (list? v.5$40)
; ((lambda (result2)
; (cons (cons-source
; (rename$29 'list)
; (cons-source test '() '(test))
; '(list test))
; #f))
; v.5$40)
; #f))
; (cdr v.3$38)))
; v.4$39))
; (car v.3$38))
; #f))
; (cdr v.1$36)))
; v.2$37))
; (car v.1$36))
; #f))
; (cdr expr$28))))))
;; TODO: seems broken
(define-syntax my-when4
(syntax-rules ()
((my-when test result1 result2 ...)
(let-syntax
((second
(syntax-rules ()
((second a b c)
b))))
(second 33 44 55)))))
;(define-syntax my-when4
; (syntax-rules ()
; ((my-when test result1 result2 ...)
; (let-syntax
; ((second
; (syntax-rules ()
; ((second a b c)
; b))))
; (second 33 44 55)))))
;(write
; (my-when4 't 1 2 3))
;; The symbol?? macro from oleg:
;; http://okmij.org/ftp/Scheme/macros.html#macro-symbol-p
(define-syntax symbol??
(syntax-rules ()
((symbol?? (x . y) kt kf) kf) ; It's a pair, not a symbol
((symbol?? #(x ...) kt kf) kf) ; It's a vector, not a symbol
((symbol?? maybe-symbol kt kf)
(let-syntax
((test
(syntax-rules ()
((test maybe-symbol t f) t)
((test x t f) f))))
(test abracadabra kt kf)))))
;;(write (symbol?? a))
(write
(my-when4 't 1 2 3))
(let-syntax
((second
(syntax-rules ()
((second a b c)
b))))
(second 33 44 55)))
; (my-when2